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D( x )
9*x-2 = 0
9*x-2 = 0
9*x-2 = 0
9*x-2 = 0 // + 2
9*x = 2 // : 9
x = 2/9
x in (-oo:2/9) U (2/9:+oo)
y = (-8*e^9*x)/(9*x-2) // - (-8*e^9*x)/(9*x-2)
y-((-8*e^9*x)/(9*x-2)) = 0
8*e^9*x*(9*x-2)^-1+y = 0
(8*e^9*x)/(9*x-2)+y = 0
(8*e^9*x)/(9*x-2)+(y*(9*x-2))/(9*x-2) = 0
y*(9*x-2)+8*e^9*x = 0
8*e^9*x+9*x*y-2*y = 0
8*e^9*x+9*x*y-2*y = 0
9*x*y-2*y = 0 // + -2*y
9*x*y = -(-2*y) // : 9*y
x = (-(-2*y))/(9*y)
x = 2/9
x-2/9 = 0
(x-2/9)/(9*x-2) = 0
(x-2/9)/(9*x-2) = 0 // * 9*x-2
x-2/9 = 0
x-2/9 = 0 // + 2/9
x = 2/9
x in { 2/9}
x belongs to the empty set
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